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Juan Cristóbal Cobo

In children physical activity is associated with better cognitive performance as measured by IQ tests and academic achievement.

In Colombia's capital city of Bogotá, a little over 75 miles of roadway are turned over each Sunday to the Ciclovía—a weekly affair where cars are banned from the streets—and as many as one-and-a-half million Bogotanos come out to bike or ride.

A young cyclist rides past a guard at the presidential palace, the Casa de Nariño.

The Ciclovía’s director, Bibiana Sarmiento, said that in a highly stratified society like Colombia’s one of the things she loves about the program is its egalitarian nature.

A bicycle built for two.

There's good people-watching at the Ciclovía.

Ciclovía is also a place for performers and activists.

Vehicular traffic compared to bike traffic during a Thursday night Nocturnal Ciclovía.